Copolyamide powder and its preparation, use of copolyamide powder in a shaping process and mouldings produced from this copolyamide powder

a technology of copolyamide powder and shaping process, which is applied in the direction of additive manufacturing with solids, electric/magnetic/electromagnetic heating, and additive manufacturing processes. it can solve the problems of non-uniformity of volume change resulting from crystallization in three-dimensional mouldings of any desired structure, displacement or even pulling away of protruding regions,

a technology of copolyamide powder and shaping process, which is applied in the direction of additive manufacturing with solids, electric/magnetic/electromagnetic heating, and additive manufacturing processes. it can solve the problems of non-uniformity of volume change resulting from crystallization in three-dimensional mouldings of any desired structure, displacement or even pulling away of protruding regions,

US20090236775A1Active Publication Date: 2009-09-24EVONIK OPERATIONS GMBH
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Examples

Experimental program
Comparison scheme
Effect test

example 1

Nylon-12 Pellets, Regulated

[0089]1000 g of laurolactam, 10.5 g of 1,12-dodecanedioic acid, 445 g of water and 0.1 g of 50% strength aqueous hypophosphorous acid were heated 1 to 280° C. under autogenous pressure (about 22 bar) in a stirred 21 V4A-steel autoclave, and, after 5 hours, depressurized to atmospheric pressure within a period of 3 hours. Nitrogen was passed over the melt for a further 2 hours. The reaction product was extruded, pelletized, and dried at 70° C.

Relative solution viscosity:1.62Extract content:1.26%by weightMelting point (DSC):177°C.Enthalpy of fusion:77J / gCOOH:119mmol / kgNH2:6mmol / kg

example 2

Nylon-12 Pellets, Unregulated

[0090]Example 1 was repeated without addition of dodecanedioic acid. The depressurization here was carried out only as far as a residual pressure of 2.7 bar, and the melt was then allowed to equilibrate under this pressure for 1 hour. The reaction product was extruded and pelletized.

Relative solution viscosity:1.62Extract content:1.05%by weightMelting point (DSC):178°C.Enthalpy of fusion:74J / gCOOH:72mmol / kgNH2:65mmol / kg

example 3

Nylon-12 / 12,12 Copolyamide Pellets, (95:5)

[0091]Example 1 was repeated with the following starting materials:

Laurolactam 851 gDodecanediamine22.9 gDodecanedioic acid26.1 g

Properties of Product:

[0092]

Relative solution viscosity:1.77Extract content:1.25%by weightMelting point (DSC):174°C.Enthalpy of fusion:69J / gCOOH:84mmol / kgNH2:31mmol / kg

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Abstract

A task often encountered in very recent times is the rapid provision of prototypes. Particularly suitable processes are those based on pulverulent materials and in which the desired structures are produced layer-by-layer through selective melting and solidification. The invention provides the constitution, production and use of a copolyamide powder which was produced using the following monomer units: a) laurolactam or ω-aminoundecanoic acid, and also b) dodecanedioic acid, and either c) decanediamine or dodecanediamine, in shaping processes, and also to mouldings produced through a layer-by-layer process which selectively melts regions of a powder layer, using this specific powder. Once the regions previously melted layer-by-layer have been cooled and solidified, the moulding can be removed from the powder bed. The mouldless layer-by-layer processes for the production of components using the copolyamide powder result in simplified and more reliable conduct of the process and better recyclability.

Description

FIELD OF THE INVENTION[0001]A task often encountered in very recent times is the rapid provision of prototypes. Particularly suitable processes are those based on pulverulent materials and in which the desired structures are produced layer-by-layer through selective melting and solidification. Support structures for overhangs and undercuts can be omitted here, since the powder bed surrounding the molten regions provides sufficient support. The subsequent work needed to remove supports is likewise no longer needed. The processes are also suitable for short-run production.DISCUSSION OF THE BACKGROUND[0002]The present invention relates to the constitution, production and use of a copolyamide powder which was produced using the following monomer units:[0003]laurolactam or ω-aminoundecanoic acid, and either[0004]dodecanedioic acid or sebacic acid, and either[0005]decanediamine or dodecanediamine,in shaping processes, and also to mouldings produced through a layer-by-layer process which s...

Claims

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Application Information

Patent Timeline
24 Sep 2009
Publication
US20090236775A1
IPC
B29C35/08; C08G69/14
CPC
C08G69/36; B29C67/0077; B29C64/153; B33Y70/00; B33Y70/10
Inventors
MONSHEIMER, SYLVIA; GREBE, MAIK